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HY29F800ATG-70 Datasheet(PDF) 9 Page - Hynix Semiconductor |
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HY29F800ATG-70 Datasheet(HTML) 9 Page - Hynix Semiconductor |
9 / 40 page 9 Rev. 1.1/Feb 02 HY29F800A The flow chart in Figure 1 illustrates the proce- dure for protecting sectors, and timing specifica- tions and waveforms are shown in the specifica- tions section of this document. Verification of pro- tection is accomplished as described in the Elec- tronic ID Mode section and shown in the flow chart. The procedure for sector unprotection is illustrated in the flow chart in Figure 2, and timing specifica- tions and waveforms are given at the end of this document. Note that to unprotect any sector, all unprotected sectors must first be protected prior to the first unprotect write cycle. Sectors can also be temporarily unprotected as described in the next section. Temporary Sector Unprotect Operation This feature allows temporary unprotection of pre- viously protected sectors to allow changing the data in-system. Temporary Sector Unprotect mode is activated by setting the RESET# pin to V ID. While START NOTE: All sectors must be previously protected. Set: TRYCNT = 1 Set: A9 = CE# = OE# = V ID Set: RESET# = V IH WE# = V IL Wait t WPP2 Set: A9 = V ID OE# = CE# = V IL Read Data Data = 0x00? NSEC = 18? YES TRYCNT = 1000? NO Increment TRYCNT NO YES DEVICE FAILURE NO YES Remove V ID from A9 SECTOR UNPROTECT COMPLETE APPLY V CC Set Sector Group Address: A[18:12] = Sector NSEC A0 = A6 = V IL A1 = V IH NSEC = NSEC + 1 Set: NSEC = 0 WE# = V IH Figure 2. Sector Unprotect Procedure in this mode, formerly protected sectors can be programmed or erased by invoking the appropri- ate commands (see Device Commands section). Once V ID is removed from RESET#, all the previ- ously protected sectors are protected again. Fig- ure 3 illustrates the algorithm. Electronic ID Mode Operation The Electronic ID mode provides manufacturer and device identification and sector protection verifi- cation through identifier codes output on DQ[7:0] or DQ[15:0]. This mode is intended primarily for programming equipment to automatically match a device to be programmed with its corresponding programming algorithm. The Electronic ID infor- mation can also be obtained by the host through a command sequence, as described in the Device Commands section. Operation in the Electronic ID mode requires V ID on address pin A[9], with additional requirements |
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